In Exodus 4:24-26, God sought to kill Moses — for neglecting to give the sign of the covenant to his infant child. Commented Calvin: “Let us then learn from hence to use reverently the sacraments, which are the seals of God’s grace — lest He should severely avenge our despisal of them!”
In Exodus 12:24-48, God debars from the second sacrament all adults whose infants still lack the first sacrament. Comments Calvin: “They should also teach their children…, for doctrine may justly be called the life of sacraments…. The Paschal Lamb corresponds to the Holy Supper…. None but the initiated were admitted…. From the analogy between the Holy Supper and the Passover, this Law remains in force now!”